On 13/07/2019 22:21, Colin Smale wrote: > So what was your point again about internal waterways? The "extent of > the realm" is not the 12-mile limit, it is ±MLW, isn't it? Assuming it is mapped correctly, this is an example of an administrative boundary that is outside the low water mark: <https://www.openstreetmap.org/way/174971215>